Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos se juntaram à Universidade de Manchester?
 ###Tabelas: CREATE TABLE top-up_additional_member_system_results (top-up_additional_member_system_results_id AUTO_INCREMENT PRIMARY KEY, Party VARCHAR, Votes INT, Share VARCHAR, Change VARCHAR, Seats VARCHAR) CREATE TABLE bioinformatics (bioinformatics_id AUTO_INCREMENT PRIMARY KEY, Application VARCHAR, Expected Speed Up† VARCHAR, GPU‡ VARCHAR, Multi-GPU Support VARCHAR, Release Status VARCHAR) CREATE TABLE current_members (current_members_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Location VARCHAR, Nickname VARCHAR, Founded INT, Type VARCHAR, Enrollment INT, Joined VARCHAR) CREATE TABLE malaysia (malaysia_id AUTO_INCREMENT PRIMARY KEY, Network VARCHAR, Origin of Programming VARCHAR, Language VARCHAR, Genre VARCHAR, Service VARCHAR) CREATE TABLE primary_education (primary_education_id AUTO_INCREMENT PRIMARY KEY, Measure VARCHAR, Bombali INT, Bonthe INT, Kailahun INT, Kambia VARCHAR, Kenema INT, Koinadugu INT, Kono INT, Moyamba VARCHAR, Port Loko VARCHAR, Pujehun INT, Tonkolili INT)  
SELECT Joined FROM current_members WHERE Institution = Manchester University